EJB @Lock doesn't work as expected

I have a scheduled EJB that calls a Singleton EJB. For some reason, the scheduled method is executed twice in each schedule (something to do with the WAR file reference as well as the EAR). To counter this, I put an annotation @Lock

on the method in the @Singleton

bean, but it still gets executed twice at the same time:

@Stateless
public class PaymoTimer {
    @EJB
    private IPaymoManagerRemote manager;

    @Schedule(hour = "10,12,14,16", minute = "41", second = "0", info = "PaymoTimer")
    public void timer() throws Exception {
        manager.generateEmailReport();
    }
}


@LocalBean
@Singleton
public class PaymoManager implements IPaymoManagerRemote {
    @Override
    @Lock(LockType.WRITE)
    public void generateEmailReport() {
        System.out.println("generateEmailReport");
        String text = getDailySummaryForUser();
        System.out.println("done");
    }
}

      

        
        
        
      

    

My console prints the following data:

12:42:00,008 INFO  [stdout] (EJB default - 10) generateEmailReport
12:42:00,009 INFO  [stdout] (EJB default - 9) generateEmailReport
12:42:24,027 INFO  [stdout] (EJB default - 10) done
12:42:24,323 INFO  [stdout] (EJB default - 9) done

      

        
        
        
      

    

Looking at the time and process ID, it becomes clear that the method is called while the previous instance is still running.

I don't understand what annotation means @Lock

?